Very good writeup!
This is very good info, but it is easy to get carried away with all this. 4v6 is serious when he says it takes patience. It takes a lot more time than anticipated. I really do not even see how you got into the bowl so good. Can you show a pic of all the tools? Especially the one used for the bowl area.
I messed up by trying to contour the casting marks in the side of the tunnel. You get carried away and ready to be finished and stop thinking. I have now found a new set of heads and will probably be leaving them stock. For now. This pic shows the casting marks I messed up on. Use caution:
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Originally Posted by 4v6
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Quote:
Originally Posted by mr2good
Im just curious if you dynoed before the port job and after the port job? Cause to get the proper flow and to know if you actually improved it instead of hurting it, it should be wetflow bench tested right? Alot of peoploe port there stuff and actually hurt it instead of doing good. I think DART heads is the one who pioneered wetflow bench testing cause they found out just doing a flowbench test wasnt accurate enough. Anyone can hog out a head and increase volume, but if it doesnt flow right its not going to help at all Not saying youre doing it wrong or anything just wondering if you actually dynoed before an after to seee the real results?
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Mr2good makes a good point. From looking at all the data 4v6 has come up with I believe these will make power, but the only real way to tell is drag times and dyno in my opinion.
One thing I noticed when messing up mine is the valve seat insert's machining made the insert a "step" into the airflow. Did you see this on any of you heads? Did you mess with it?
4v6 this is amazing work and data. Beautiful curves on the finished ports. I always enjoy reading your threads like this. Please, keep up the good work and thanks!